srcimagewidget.cpp

#include "srcimagewidget.h"
#include "ui_srcimagewidget.h"
#include <QPainter>

SrcImageWidget::SrcImageWidget(QWidget *parent) :
    QFrame(parent),
    ui(new Ui::SrcImageWidget)
{
    ui->setupUi(this);
    setFrameStyle(QFrame::Panel|QFrame::Sunken);
}

SrcImageWidget::~SrcImageWidget()
{
    delete ui;
}

void SrcImageWidget::paintEvent(QPaintEvent *event)
{
    if(src && !src->isNull())
    {
        QPainter painter(this);
        painter.setRenderHint(QPainter::SmoothPixmapTransform);
        QRect targetRect = rect();
        QImage scaledImage = src->scaled(targetRect.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
        QRect imageRect = QRect((targetRect.width() - scaledImage.width()) / 2,
                               (targetRect.height() - scaledImage.height()) / 2,
                               scaledImage.width(), scaledImage.height());
        painter.drawImage(imageRect, scaledImage);
    }
    QFrame::paintEvent(event);
}

void SrcImageWidget::showPic(QImage *p)
{
    src = p;
    update();
}